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• What is substitute for ffmpeg video filter "between" for audio filter

  18 janvier 2018, par Hekimen

  i want make a short video preview from long video with audio, but i have problem to select audio stream segments on specific timestamps.
  I am using this option for segmenting video

  -filter_complex "[0:v]select='between(t,216,220.5)+between(t,432,436.5)+between(t,648,652.5)+between(t,864,868.5)+between(t,1080,1084.5)+between(t,1296,1300.5)+between(t,1512,1516.5)+between(t,1728,1732.5)+between(t,1944,1948.5)+between(t,2160,2164.5)'[outv]"

  and my question is how this option rewrite for audio stream, because when i use just -filter without selecting any stream then i get error : Cannot connect video filter to audio input

  I am using this ffmpeg version :

  ffmpeg version 3.3.3-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.4.0 (Debian 6.4.0-2) 20170724
  configuration : —enable-gpl —enable-version3 —enable-static —disable-debug —disable-ffplay —disable-indev=sndio —disable-outdev=sndio —cc=gcc-6 —enable-fontconfig —enable-frei0r —e
  nable-gnutls —enable-gray —enable-libass —enable-libfreetype —enable-libfribidi —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopus —enable-librtm
  p —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwebp —enable-libx264 —enable-libxvid
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  libpostproc    54.  5.100 / 54.  5.100
  

• ffmpeg generate thumbnails on GPU

  22 juin 2018, par Oleksandr Kyrpa

  I try to generate thumbnails with acceleration on GPU, so compile ffmpeg 3.4.1 and run command :

  ./ffmpeg  -i ~/Videos/1080.mp4 -vf "hwupload_cuda,thumbnail_cuda=100,scale_cuda=107:60,hwdownload,format=yuv420p" -vframes 1 -y ~/Videos/thumbs/thumb%03d.jpg

  But I get wrong output picture (the color of thumbnail is green) :

  

  Correct image must be black.
  How to make first image with correct color ?

  

  log : -loglevel verbose

  ffmpeg version N-89707-g89b84cb Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
    configuration: --cpu=native --enable-pthreads --extra-version=hd --enable-gnutls --enable-vaapi --enable-vdpau --enable-nonfree --enable-gpl --enable-swscale --enable-libx264 --enable-version3 --enable-nvenc --enable-libnpp --enable-cuda --enable-cuvid --enable-cuda-sdk --enable-filter=scale_cuda --enable-filter=thumbnail_cuda --extra-cflags=-I/usr/local/cuda-8.0/include --extra-ldflags=-L/usr/local/cuda-8.0/lib64
  
    libavutil      56.  7.100 / 56.  7.100
  
    libavcodec     58.  9.100 / 58.  9.100
  
    libavformat    58.  3.100 / 58.  3.100
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7. 11.100 /  7. 11.100
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  [h264 @ 0x392ed40] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/alex/Videos/1080.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2012-05-30T20:01:34.000000Z
  
    Duration: 00:01:14.21, start: 0.000000, bitrate: 5476 kb/s
  
      Stream #0:0(und): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(left), 1920x1080 (1920x1088), 5321 kb/s, 29.97 fps, 29.97 tbr, 60k tbn, 59.94 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 152 kb/s (default)
  
      Metadata:
  
        creation_time   : 2012-05-30T20:01:34.000000Z
  
        handler_name    : IsoMedia File Produced by Google, 5-11-2011
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  [h264 @ 0x3a38280] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  [Parsed_thumbnail_cuda_1 @ 0x4e3d8c0] batch size: 100 frames
  
  [graph 0 input from stream 0:0 @ 0x4e8b640] w:1920 h:1080 pixfmt:yuv420p tb:1/60000 fr:30000/1001 sar:0/1 sws_param:flags=2
  
  [auto_scaler_0 @ 0x4e8ca00] w:iw h:ih flags:'bicubic' interl:0
  
  [format @ 0x4e8b540] auto-inserting filter 'auto_scaler_0' between the filter 'Parsed_format_4' and the filter 'format'
  
  [Parsed_scale_cuda_2 @ 0x4e89380] w:1920 h:1080 -> w:107 h:60
  
  [swscaler @ 0x4ebf0c0] deprecated pixel format used, make sure you did set range correctly
  
  [auto_scaler_0 @ 0x4e8ca00] w:107 h:60 fmt:yuv420p sar:0/1 -> w:107 h:60 fmt:yuvj420p sar:0/1 flags:0x4
  
  Output #0, image2, to '/home/alex/Videos/thumbs/thumb%03d.jpg':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      encoder         : Lavf58.3.100
  
      Stream #0:0(und): Video: mjpeg, 1 reference frame, yuvj420p(pc, left), 107x60, q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : VideoHandler
  
        encoder         : Lavc58.9.100 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  [Parsed_thumbnail_cuda_1 @ 0x4e3d8c0] frame id #76 (pts_time=2.535867) selected from a set of 100 images
  
  No more output streams to write to, finishing.
  
  frame=    1 fps=0.9 q=3.1 Lsize=N/A time=00:00:02.56 bitrate=N/A speed=2.26x    
  
  video:2kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Input file #0 (/home/alex/Videos/1080.mp4):
  
    Input stream #0:0 (video): 115 packets read (134655 bytes); 101 frames decoded; 
  
    Input stream #0:1 (audio): 1 packets read (9 bytes); 
  
    Total: 116 packets (134664 bytes) demuxed
  
  Output file #0 (/home/alex/Videos/thumbs/thumb%03d.jpg):
  
    Output stream #0:0 (video): 1 frames encoded; 1 packets muxed (1864 bytes); 
  
    Total: 1 packets (1864 bytes) muxed

  UPDATE, working !
  Add format=nv12 before hwupload

  -vf "format=nv12,hwupload_cuda,thumbnail_cuda,scale_cuda=1280:72‌​0,hwdownload,format=‌​nv12"

• How can i make drawtext filter start the text scrolling from the center while scrolling from right to left

  16 janvier 2018, par Femzy

  Hello How can i make the text start from the center when the video play ? Currently it start from the left side and people dont see the first words before it goes. I want the text to start from either the center of the video or the right while moving from right to left. Thanks in advance for helping me...
  This is my code that currently works for the text, but it starts from the edge of the of the left while moving from right to left

  echo shell_exec('ffmpeg -loop 1 -i slide2.jpg -vf scale=-2:1080,drawtext="textfile=text.txt:expansion=normal:fontfile=FreeSerif.otf: y=h-line_h-20:x=-200*t: fontcolor=white: fontsize=50" -pix_fmt yuv420p -t '.$words_count.' -movflags +faststart textover10.mp4 -report');